Chất nào dưới đây không phải là este?
A. HCOOC6H5 B. HCOOCH3 C. CH3COOH D. CH3COOCH3

Write the complete balanced equation for the reaction between lead (iv) oxide (pbo2) and water (h2o).

Which set of characteristics best describes igneous rock? a) largest type of rock, made of organic matter, hardest type of rock b) least abundant type of rock, made of other rocks, made mostly of minerals c) found on all continents, contains wavy bands of stripes, contains fossils d) most abundant type in earth's crust, made of magma/lava, contains no fossils

Quiz1. which physical state of nitrogen has the highest entropy? a solid© b gasoc liquid